1. Fossils!
Key Point #1: Fossils are the remains or imprints of an organism that lived long ago.
Preserved tissue, shell or skeleton turned into stone, imprints left in the Earth.

2. Rock Layers
The further you dig, the further back in time you are traveling.

3. Out loud questions Surface of the earth 1. Which species is oldest?
Species A
Species B and A
Species B
Species C
2. Which species is youngest?

4. A little bit harder
1. Sedimentary Rocks stack on top of each other horizontally. They form over MILLIONS of years

5. A little bit harder
Intrusion layer: Rocks that were liquid (maybe magma from a volcano) and cut across stacked rocks.
INTRUSION LAYERS ARE ALWAYS YOUNGER THAN THE STACKED ROCKS!!!

6. KEY POINT #2 There are two ways to find out how old a fossil is
Radioactive dating
Relative dating

7. 1. Radioactive Dating
Uses the breakdown of radioactive elements (remember you learned what an element was in physical science!) to date fossils.
Gives an actual age in years for a fossil!

8. How you might be tested on this
If there is 1200 lbs of Stronitium left, how old is the sample fossil you are examining?

9. 2. Relative dating
Shows whether a fossil is older or younger than other fossils by comparing the same fossils found in different locations

10. The most important tool for relative dating is INDEX FOSSILS
Index fossil: a fossil is used to find the age of a group of rocks.
An index fossil must have these four characteristics:
Must be easy to identify
Must be very common
Must have lived for a short period of time
Must have existed all across the world

11. If index fossils are found in one group of rocks, then the rocks with these same fossils must be the same age EVEN IF THEY ARE FOUND REALLY FAR APART FROM EACH OTHER
Index fossils
Index fossils

12. If index fossils are found in one group of rocks, then the rocks with these same fossils must be the same age EVEN IF THEY ARE FOUND REALLY FAR APART FROM EACH OTHER

13. Out loud: What is older, 4 or 5? Why?

14. Key Point #3 Fossils provide evidence for evolution in two ways:
General trends
Transitional forms

15. 1. General Trends
Fossils show that life on earth has changed dramatically over time!
Important:
The further you dig, the more simple the creatures are.

16. 2. Transitional Forms
Transitional form: an organism that has traits somewhere in between its ancient ancestors and organisms that came after it.

17. Famous fossil record
Transitional forms have some characteristics of the old, some of the new. They show change over time!

18. DNA
The more DNA 2 organisms share the more closely related they are.

19. DNA Human: ATTACTGAC Chimp: ATTACTGAG Deer: AAAACTGCG
Chimps and humans are more closely related than humans and deer

20. DNA
DNA provides proof of evolution by showing that organisms that are more closely related have MORE DNA in common.

21. Which one is the cow?
cat cow horse human

22. Embryology
Embryos are eukaryotic organisms in their earliest stages of development.

23. Embryology

24. Embryology
All embryos look almost identical in the early stages of development—that’s not a coincidence! The similarities in this stage represents a common ancestor that all the organisms evolved from.

25. The fact that all animal embryos are so similar shows that ALL animals evolved from the SAME common ancestor

26. Embryology
Embryos will be most similar in early stages/different in latest stages.

27. BINGO!!!!! Fill in your board and let’s play 
Best guided practice EVER!

28. Rules You need bingo in any direction to win
We are going over EVERY OTHER problem
Do not say the answer to the one we are not going over in class
If you do, you cant win!

29. What is older, fossil 1 or fossil 8?

30. What is older, A or B? B A

31. Organism B is known as a ______________________
CAN BITE BUT
HAS NO TEETH
CAN BITE, CHEWS PREY
WITH TEETH B
CAN BITE, HAS TEETH
BUT SWALLOWS
PREY WHOLE
Organism B is known as a ______________________

32. An imprint of an organism

33. A type of rock that is formed as horizontal layers over millions of years

34. What is YOUNGER, 3 or 6?

35. What is older, 1 or 6?

36. What is older, M or F? F M

37. This fossil is found in two areas thousands of miles away from each other, it helps scientists date the two sets of rocks. It is called a _______ fossil F M

38. Which layer is the oldest?
Fossil #1
Fossil #2
Fossil #3
ROCK LAYER A
ROCK LAYER B
ROCK LAYER C

39. Which fossil is the youngest?
ROCK LAYER A
ROCK LAYER B
ROCK LAYER C

40. Which fossil is least complex?
ROCK LAYER A
ROCK LAYER B
ROCK LAYER C

41. Where would you look for a transitional form between Fossil #2 and Fossil #3 in the picture below?
ROCK LAYER A
ROCK LAYER B
ROCK LAYER C

42. What is older, C or D?

43. Which is older, D or E?

44. Which rock layer is the youngest?

45. The technique where scientists use elements present in rocks to find out how old they are

46. Which is older, K or F? J F K G

47. Intrusion rocks are always _________ than the sedimentary rocks they cut through

48. Work on the worksheet!

49. In your folder Grade sheet Exit Slip Daily Quiz Independent Practice
Homework: Worksheet